Ataxia-Telangiectasia or Louis-Bar Syndrome

Reviewed By: Pramod Kerkar, MD, FFARCSI

What Is Ataxia-Telangiectasia Or Louis-Bar Syndrome?

Ataxia-Telangiectasia or Louis-Bar Syndrome is a very rare pathological condition present in children in which the brain gets affected adversely causing symptoms and complications. This disease may also affect different parts of the body. Ataxia means uncontrolled movements usually when ambulating and telangiectasia means enlargement of blood vessels underneath the skin surface.

What Are The Causes Of Ataxia-Telangiectasia Or Louis-Bar Syndrome?

Ataxia-Telangiectasia or Louis-Bar Syndrome is an inherited disorder from one generation to another in a family. This disease is an autosomal recessive disorder which means that the child needs to get a copy of the defective gene from both parents. This disease develops due to mutation in the ATM gene or the ataxia telangiectasia mutated gene which results in cell deaths abnormally at various parts of the body to include the brain which is responsible for movements in the body causing various complications. This disease affects boys and girls equally.

What Are The Symptoms Of Ataxia-Telangiectasia Or Louis-Bar Syndrome?

Some of the symptoms of Ataxia-Telangiectasia or Louis-Bar Syndrome are:

Reduced coordination of movements along with abnormal gait and unsteadiness

Reduced mental development

Delayed ambulation abilities

Discoloration of skin, especially parts that are exposed to sunlight

Enlarged blood vessels in nose, ears, or inside of elbow or knee

Enlarged blood vessels in whites of eyes

Presence of nystagmus

Seizures

Radiation sensitivity

How Is Ataxia-Telangiectasia Or Louis-Bar Syndrome Diagnosed?

Ataxia-Telangiectasia or Louis Bar Syndrome is usually diagnosed based on the characteristic features ataxia, telangiectasia, abnormal ocular movements and impairment of speech. This diagnosis can be confirmed by laboratory screening. With observation of all the clinical signs and symptoms the diagnosis can be made relatively easily. The diagnosis of Ataxia-Telangiectasia or Louis Bar Syndrome is difficult to make in infants as they have only one symptom of progressive ataxia which can be a sign of many other disease conditions. Telangiectasias are not observed in infants until they are about six years of age and that too is not present in a few cases. The ocular movements are basically normal in infants with Ataxia-Telangiectasia or Louis Bar Syndrome making the diagnosis that more difficult. Hence to diagnose this condition in such cases, there is a laboratory testing to measure alpha fetoprotein in the blood as the levels will be significantly elevated in infants with Ataxia-Telangiectasia or Louis Bar Syndrome. Some of the other tests that can confirm the diagnosis are:

Elevated level of CA-125, another blood protein

Increased chromosomal breakdown when the blood cells are exposed to x-rays

Western Blot test showing absence of the ATM gene

Genetic tests showing mutation in the ATM gene

What Are Treatments For Ataxia-Telangiectasia Or Louis-Bar Syndrome?

As of now, there is no definitive cure for Ataxia-Telangiectasia or Louis Bar Syndrome. The physician basically provides supportive treatment and it is aimed at controlling the symptoms and preventing complications. The treatment requires a multidisciplinary approach in which the family members of the affected individual, the treating physician, immunologist, pulmonologist as well as a neurologist are all closely involved. There will also be vital inputs made by occupational therapists, physical therapist, nutritionist, and speech therapist for specific issues that the patient may have. For example, if the patient has swallowing problems because of which it takes quite a lot of time for the patient to finish the meals and the patient may not get enough nutrition. In such cases if they are identified early enough placement of a gastrotomy tube is of tremendous help to the patient to provide supplemental nutrition.

Additionally, any suspected infection needs to be treated promptly and adequately as individuals with Ataxia-Telangiectasia or Louis Bar Syndrome have a compromised immune system hence they have a tendency to catch infections early, thus they should be monitored and the environment around them needs to be clean and uninfected.

Individual with Ataxia-Telangiectasia or Louis Bar Syndrome tend to have serious respiratory system ailments with problems with deep breathing and persistent coughing episodes. These also need to be monitored and treated adequately. If respiratory problems are identified early enough then the individual should undergo a comprehensive respiratory care program to prevent serious complications.

Since individuals with Ataxia-Telangiectasia or Louis Bar Syndrome have breakdown of chromosomes when exposed to x-rays hence such individuals should be exposed to x-rays only when it is absolutely necessary.

Most children with Ataxia-Telangiectasia or Louis Bar Syndrome are able to attend normal school but as the disease progresses there will come a time when they require full time assistance with their activities of daily living both at home and at school. Since the eyes may get affected hence it may become difficult for the child to read information properly resulting in decline in academic performance. In such cases, regular counseling of the patient and the family is usually quite helpful.

What Are Some Of The Realistic Expectations For Individuals With Ataxia-Telangiectasia Or Louis-Bar Syndrome?

Ataxia-Telangiectasia or Louis Bar Syndrome is medical condition which advances with time but it cannot be predicted as how the disease will progress. The progression of the disease varies from individual to individual. If the affected individual is made aware of what to expect then it becomes easier for the individual to cope with the disease and it also ultimately affects the progression of the disease process: Some potential expectations from the disease which an individual should be aware of are:

Persistent chronic cough may be a sign of a lung infection

Choking episodes when drinking liquids may indicate an aspiration problem

If a child starts regressing in his or her ability to grow then it may indicate nutritional problems.

Immunodeficiency is suggested in cases of persistent and frequent infections which do not improve with appropriate medications

Such situations should be recognized early and communicated to the treating physician so that early treatment can be started and the progression of the disease is controlled.

To be realistic, even though the affected individual may be aware of the complications and he or she may even address those issues but still there is some amount of neurological deterioration, hence realistically speaking anyone suffering from Ataxia-Telangiectasia or Louis Bar Syndrome will have ambulation difficulties, and will require wheelchair for ambulation with the progression of the disease. There will be some degree of lung damage as well despite prompt treatment of infections.

Of note with the advancement of medical science to where it is today, with continuing research the day is not far when Ataxia-Telangiectasia or Louis Bar Syndrome may have a definitive cure.